--- /dev/null
+/****************************************************************************
+*
+* wxWindows HTML Applet Package
+*
+* Copyright (C) 1991-2001 SciTech Software, Inc.
+* All rights reserved.
+*
+* ========================================================================
+*
+* The contents of this file are subject to the wxWindows License
+* Version 3.0 (the "License"); you may not use this file except in
+* compliance with the License. You may obtain a copy of the License at
+* http://www.wxwindows.org/licence3.txt
+*
+* Software distributed under the License is distributed on an
+* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+* implied. See the License for the specific language governing
+* rights and limitations under the License.
+*
+* ========================================================================
+*
+* Language: ANSI C++
+* Environment: Any
+*
+* Description: This file is the implementation of the Preprocessor object
+* for parsing the <!--#if directive
+*
+****************************************************************************/
+
+// For compilers that support precompilation
+#include "wx/wxprec.h"
+#include "wx/html/forcelnk.h"
+
+// Include private headers
+#include "wx/applet/prepifelse.h"
+#include "wx/applet/ifelsevar.h"
+
+/*---------------------------- Global variables ---------------------------*/
+
+
+/*----------------------------- Implementation ----------------------------*/
+
+/* {SECRET} */
+/****************************************************************************
+REMARKS:
+None of the Reverse Find functions in wxWindows appear to work in a way that
+can be used by our code. This includes the libstr rfind implementations which
+do not correctly pass the given return value.
+****************************************************************************/
+int ReverseFind(
+ const wxString &tstr,
+ const wxString &str)
+{
+ wxASSERT( str.GetStringData()->IsValid() );
+
+ // TODO could be made much quicker than that
+ int p = tstr.Len()-str.Len()-1;
+ while ( p >= 0 ) {
+ if ( wxStrncmp(tstr.c_str() + p, str.c_str(), str.Len()) == 0 )
+ return p;
+ p--;
+ }
+
+ return -1;
+}
+
+/****************************************************************************
+PARAMETERS:
+text - HTML to process for if/else blocks
+
+RETURNS:
+The string containing the processed HTML
+
+REMARKS:
+This function replaces #if, #else, and #endif directives with the text
+contained within the blocks, dependant on the value of the given boolean
+variable. The variable is created by making a sub class of wxIfElseVariable.
+Dynamic class construction is used at run time internally to create an instance
+of this class and access the value of the variable.
+
+SEE ALSO:
+wxIfElseVariable
+****************************************************************************/
+wxString wxIfElsePrep::Process(
+ const wxString& text) const
+{
+ int b;
+ char ft[] = "<!--#if ";
+
+ // make a copy so we can replace text as we go without affecting the original
+ wxString output = text;
+ while ((b = ReverseFind(output.Lower(), ft)) != -1) {
+ // Loop until every #echo directive is found
+ // We search from the end of the string so that #if statements will properly recurse
+ // and we avoid the hassle of matching statements with the correct <!--#endif-->
+ int end, c, n;
+ wxString usecode, code;
+ wxString cname;
+ wxString tag;
+ bool value;
+
+ code = wxString("");
+
+ // grab the tag and get the name of the variable
+ end = (output.Mid(b)).Find("-->");
+ if (end == -1) {
+#ifdef CHECKED
+ wxMessageBox("wxHTML #if error: Premature end of file while parsing #if.","Error",wxICON_ERROR);
+#endif
+ break;
+ }
+
+ end += 3;
+ tag = output.Mid(b, end);
+ output.Remove(b, end);
+
+ c = tag.Find("-->");
+ n = c;
+
+ // find the classname
+ c = (tag.Mid(8, n-8)).Find(" ");
+ if (c == -1) n -= 8;
+ else n = c;
+ cname = tag.Mid(8, n);
+
+ cname.Trim(false);
+ c = cname.Find("\"");
+ if (c != -1) cname = cname.Mid(c+1);
+ c = cname.Find("\"");
+ if (c != -1) cname = cname.Mid(0, c);
+
+ // Grab the value from the variable class identified by cname
+ value = wxIfElseVariable::GetValue(cname);
+
+ // Find the end of the tag (<!--#endif-->) and copy it all into the variable code
+ end = ((output.Mid(b)).Lower()).Find("<!--#endif-->");
+ if (end == -1) {
+#ifdef CHECKED
+ wxMessageBox("wxHTML #if error: Premature end of file while searching for matching #endif.","Error",wxICON_ERROR);
+#endif
+ break;
+ }
+
+ code = output.Mid(b, end);
+ output.Remove(b, end+13); // remove the entire #if block from original document
+
+ // Find out if there is an else statement
+ end = (code.Lower()).Find("<!--#else-->");
+ if (end != -1) {
+ if (!value) {
+ // Use the else statement
+ usecode = code.Mid(end+12);
+ }
+ else {
+ // Use statement before #else
+ usecode = code.Mid(0, end);
+ }
+ }
+ else if (value) {
+ // There is no #else statement
+ usecode = code;
+ }
+
+ if (usecode != wxString(""))
+ output = (output.Mid(0,b) + usecode + output.Mid(b));
+ }
+
+ return output;
+}
+
+FORCE_LINK(ifelsevar)
projects / wxWidgets.git / blobdiff